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invisible ink

   Also found in: Wikipedia 0.02 sec.
invisible ink
n.
Ink that is colorless and invisible until treated by a chemical, heat, or special light. Also called sympathetic ink.
invisible ink
n
(Chemistry) a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc.
Translations
invisible ink n → inchiostro simpatico
invisible ink n → inchiostro simpatico


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Since invisible ink is used, 2D barcodes can be printed over paper prints, not restricted by original print designs and layouts.
IBM Japan and Connect Technology Use Invisible 2D Barcodes to Combine ... by JCNN News Summaries
When he had learned enough, Townsend composed an invisible ink message to Washington and sent the message back along the ring route to General Washington.
Washington's spies: General George Washington's intelligence network ... by Gilmore, Jodie / The New American
In George Washington's day, spies relied on secret signals and invisible inks that would probably amuse 21st century children.
Hidden Secrets: a Complete History of Espionage and the Technology ... by Science News
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